Puas yog RS 232 5V lossis 3.3V?

Peb yuav tsum nkag siab txog keeb kwm thiab kev loj hlob ntawm tus qauv RS232. Tus qauv RS232 tau pib ua tswvcuab los ntawm Electronics Industry Alliance (EIA) hauv xyoo 1960s, txhawm rau muab txoj kev sib kis tau zoo rau kev sib txuas lus ntawm cov khoos phis tawj thiab lwm yam khoom siv hluav taws xob. Thaum pib ntawm qhov kev taw qhia ntawm tus qauv no, qhov hluav taws xob theem ntawm 5V tau dav siv, ib feem yog vim cov khoom siv hluav taws xob nyob rau lub sijhawm ntawd feem ntau siv 5V raws li tus qauv kev khiav hauj lwm voltage, thiab ib feem yog vim 5V voltage muaj peev xwm muab lub viav vias txaus los xyuas kom meej cov teeb liab nyob deb. kis tau tus mob thiab tiv thaiv kev cuam tshuam.
Txawm li cas los xij, nrog kev txhim kho ntawm cov cuab yeej siv hluav taws xob, tshwj xeeb tshaj yog kev nce qib ntawm cov txheej txheem tsim hluav taws xob sib xyaw ua ke, 3.3V logic qib tau pib nrov hauv cov khoom siv hluav taws xob. Qhov no feem ntau yog vim qhov qis qis qis tuaj yeem txo qis kev siv hluav taws xob, txo qhov tsim hluav taws xob, txhim kho kev sib koom ua ke, thiab kuj tau sib xws nrog cov thev naus laus zis tshiab semiconductor. Cov txiaj ntsig zoo no tau ua rau qib 3.3V logic maj mam xaiv qhov nyiam rau qee cov khoom siv tshiab thiab cov tshuab.
Yog li, rov qab rau peb lo lus nug: Puas yog RS 232 5V lossis 3.3V? Lo lus teb tsis yog ib qho yooj yim ib lossis ob qho kev xaiv. Raws li tus qauv RS232 tus qauv, cov yam ntxwv hluav taws xob tau teev tseg yog qhov tseeb raws li qhov ntsuas hluav taws xob ntawm ± 5 txog ± 15 volts. Qhov no txhais tau hais tias ib txwm RS232 interfaces siv hluav taws xob viav vias saum 5V los sawv cev cov ntaub ntawv qhia. Txawm li cas los xij, nrog rau kev tsim cov thev naus laus zis tshiab, qee cov tuam txhab tau pib muab cov qauv hluav taws xob tsawg ntawm RS232 interfaces, uas yuav siv tau qhov hluav taws xob viav vias ntawm 3.3V lossis qis dua.
Qhov kev hloov pauv no tau ua rau muaj kev tsis sib haum xeeb thiab tsis meej pem. Ntawm qhov tod tes, siv lub viav vias qis qis tuaj yeem ua tau zoo dua nrog niaj hnub qis-voltage logic circuits, txo kev cia siab rau cov khoom siv hluav taws xob 5V. Ntawm qhov tod tes, cov kev hloov pauv no tuaj yeem cuam tshuam rau kev sib raug zoo nrog cov khoom siv uas twb muaj lawm, tshwj xeeb tshaj yog cov tsim nrog tsuas yog 5V voltage viav vias txiav txim siab.
Hauv kev siv tswv yim, kev xaiv ntawm 5V lossis 3.3V RS232 interface nyob ntawm ntau yam. Yog tias tus neeg siv txuas mus rau lub qub RS232 ntaus ntawv, ib txwm siv 5V RS232 interface yuav xav tau los xyuas kom muaj kev sib raug zoo thiab kev sib txuas lus zoo. Yog tias cov khoom siv txuas nrog yog cov tiam tshiab thiab tuaj yeem txhawb nqa qis qis qis, 3.3V RS232 interface tuaj yeem xaiv. Txawm li cas los xij, txawm tias thaum siv 3.3V RS232 interface, kev ntsuas kev sib raug zoo ntawm lub voj voog feem ntau yog tsim, xws li qib hloov pauv lossis hloov pauv, kom ntseeg tau tias cov cuab yeej tsis puas vim qhov tsis sib xws ntawm qhov hluav taws xob.
Qhov voltage theem ntawm RS232 tus qauv tsis ruaj khov thiab tsis hloov pauv, nws hloov zuj zus nrog kev nce qib thiab kev lag luam xav tau. Cov tsoos RS232 interface siv qhov hluav taws xob viav vias ntawm 5V, thaum lub cim tshiab ntawm cov khoom siv tuaj yeem txhawb nqa voltage viav vias ntawm 3.3V lossis qis dua. Thaum xaiv RS232 interface, cov neeg siv yuav tsum txiav txim siab seb qhov voltage yuav siv li cas raws li lawv cov cuab yeej thiab daim ntawv thov scenario, thiab coj cov kev ntsuas sib xws. Nrog rau kev nce qib ntawm kev siv thev naus laus zis, tej zaum yuav muaj ntau qhov sib txawv ntawm RS232 tus qauv yav tom ntej, tab sis txawm hais tias, kev nkag siab txog nws cov yam ntxwv hluav taws xob thiab kev sib raug zoo yuav yog tus yuam sij kom ua tiav kev sib txuas lus.